Qt XML validation Errorhandling - c++

Question

I'm trying to find a solution that in case that a validation is not successful because there is more then one error in the XML file the Qt MessageHandler(line, column, description etc. ) is able to show every error in the XML data not just the first one that occurs in the XML file.
Example:
I have an error in line: 65 (see pic)
but there are also errors in line :78,83,95 but it dose not show it only shows the first one.
Is there a solution for this case? And if yes how?
My Code looks like this:
MessageHandler messageHandler;
QFile xsdfile("....xsd");
xsdfile.open(QIODevice::ReadOnly);
QXmlSchema schema;
schema.setMessageHandler(&messageHandler);
bool errorOccurred = false;
if (schema.load(&xsdfile, QUrl::fromLocalFile(xsdfile.fileName())) == false)
errorOccurred = true;
else
{
QXmlSchemaValidator xmlvalidator(schema);
QFile xmlfile("......xml");
xmlfile.open(QIODevice::ReadOnly);
if (!xmlvalidator.validate(&xmlfile, QUrl::fromLocalFile(xmlfile.fileName())))
errorOccurred = true;
xmlfile.close();
}
xsdfile.close();
if (errorOccurred) {
QString qs = messageHandler.statusMessage();
cout << "Line: " << messageHandler.line() << "\n" << "Row: " << messageHandler.column() << "\n" << "ErrorMessage: ";
std::cout << qs.toUtf8().constData() << std::endl;
return -1;
}
else {
return 0;
}
And my MessageHandler class looks like this:
class MessageHandler : public QAbstractMessageHandler
{
public:
MessageHandler()
: QAbstractMessageHandler(0)
{
}
QString statusMessage() const
{
return m_description;
}
int line() const
{
return m_sourceLocation.line();
}
int column() const
{
return m_sourceLocation.column();
}
protected:
virtual void handleMessage(QtMsgType type, const QString &description,
const QUrl &identifier, const QSourceLocation &sourceLocation)
{
Q_UNUSED(type);
Q_UNUSED(identifier);
m_description = description;
m_sourceLocation = sourceLocation;
}
private:
QString m_description;
QSourceLocation m_sourceLocation;
};
Thanks :)

Answer 1

I think you need to write a custom validator to catch all errors. You can modify this example code to catch all errors.
struct NodeProperties
{
NodeProperties()
{
values.resize(names.size());
}
std::vector<int> values;
static QStringList names;
static QString rootName;
static QString childName;
};
QString NodeProperties::rootName = "static_route";
QString NodeProperties::childName = "molenet";
QStringList NodeProperties::names = QList<QString>() << "node_id"
<< "nextHop_id"
<< "sink_id"
<< "delay_before_send"
<< "delay_before_sleep";
QList<NodeProperties> nodesProperties;
bool parseXMLFile()
{
QXmlStreamReader xmlStreamReader;
QString xmlFile;
xmlFile = QFileDialog::getOpenFileName(this,
tr("Open XML file"), QDir::currentPath(), tr("XML (*.xml)"));
if(xmlFile.isEmpty())
return false;
QFile file(xmlFile);
if (!file.open(QFile::ReadOnly | QFile::Text))
{
QMessageBox::warning(this,tr("Error: Cannot read file ..."),
(xmlFile+" " + file.errorString() ));
return false;
}
nodesProperties.clear();
xmlStreamReader.setDevice(&file);
xmlStreamReader.readNext();
while(!xmlStreamReader.atEnd())
{
if(xmlStreamReader.isStartElement())
{
if(xmlStreamReader.name() == NodeProperties::rootName)
xmlStreamReader.readNext();
if(xmlStreamReader.name() == NodeProperties::childName)
{
xmlStreamReader.readNext();
if(xmlStreamReader.isCharacters() )
xmlStreamReader.readNext();
if(xmlStreamReader.isStartElement())
{
NodeProperties prop;
for(int i = 0; i < NodeProperties::names.size(); ++i)
{
if(xmlStreamReader.isCharacters() )
{
xmlStreamReader.readNext();
--i;
continue;
}
if(xmlStreamReader.name() == NodeProperties::names[i])
{
prop.values[i] = xmlStreamReader.readElementText().toInt();
}
xmlStreamReader.readNext();
}
nodesProperties.push_back(prop);
}
}
}
xmlStreamReader.readNext();
}
file.close();
if (xmlStreamReader.hasError())
{
QMessageBox::warning(this,tr("Error: Failed to parse file "),
(xmlFile+" " + xmlStreamReader.errorString() ));
nodesProperties.pop_back();
}
else if (file.error() != QFile::NoError)
{
qDebug() << "Error: Cannot read file " << qPrintable(xmlFile)
<< ": " << qPrintable(file.errorString());
}
//createGraphVizFile(xmlFile);
this->xmlFile = xmlFile;
return true;
}
The XML file is:
<?xml version="1.0"?>
<static_route>
<molenet>
<node_id> 1 </node_id>
<nextHop_id> 2 </nextHop_id>
<sink_id> 254 </sink_id>
<delay_before_send> 2 </delay_before_send>
<delay_before_sleep> 30 </delay_before_sleep>
</molenet>
<molenet>
<node_id> 2 </node_id>
<nextHop_id> 3 </nextHop_id>
<sink_id> 254 </sink_id>
<delay_before_send> 4 </delay_before_send>
<delay_before_sleep> 30 </delay_before_sleep>
</molenet>
</static_route>